Category: Equipment

Amateur radio equipment reviews. Based on my direct experience or taken from other sources

160 Meter linear loaded Tee vertical doublet antenna

Posted on by Simone

I decided to publish this website in order to pass on some insights about this antenna that I’ve garnered through extensive experimentation. A warning though, some of the combined design aspects of the antenna may be unique and unorthodox, a think out of the box antenna design. Note! I do not have a B.S. or…

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Cubical Quad Design

Posted on by Simone

The frequency scaling formulas for Cubical Quad antennas are shown in this picture. Note that frequency is measured in Megahertz {MHz} and the total length of each element is measured in feet {ft}. The spacing of each element is the same and all directors are the same size. The gamma match uses a small air…

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Programming VHF/UHF Radios

Posted on by Simone

The purpose of this article is to give you an idea of what you will need to do to set up a new radio for basic Simplex, Repeater, and Memory operation so that you will have an idea of what to look for and concentrate on in the instruction manual for your radio. Programming a…

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Discone Antenna for RTL SDR

Posted on by Simone

I have been getting into software defined radio via RTLSDR and found the stock antennas woeful for reception and picked up a tonne of noise from my LCD and laptop – though it’s hardly surprising.  So to improve the situation and spend as little as possible I decided to make a discone antenna.  After some…

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Ultra-portable 5ele 144MHz Pocket Portable Yagi

Posted on by Simone

Please feel free to build or distribute the information on these antennas. G4DHF retain the copyright to the designs and ask that they are not manufactured for commercial gain. Introduction This is a design for a 5 element 2 Metre beam with a forward gain of 8dBD and a front to back ratio of over…

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